New insights into complex vortex-induced vibrations through 3D modeling and wake response analysis

In this work we focus on simulating vortex-induced vibrations (VIV) using real-time numerical simulations and validating their accuracy. We employed the boundary data immersion method (BDIM) to conduct simulations for one-degree-of-freedom (1DOF) VIV. The simulations demonstrated good agreement with experimental data at low reduced velocities and non-dimensional amplitudes. However, at higher reduced velocities and amplitudes, three-dimensional (3D) effects become more significant, resulting in poor comparisons of 2D simulations with physical experiments. Simulations were extended to 3D, showing that 2D simulations were inadequate in reproducing certain wake modes, such as 2P mode, whereas 3D simulations successfully reproduce these modes. Additionally, 2D simulations were used to recreate the wake response map of 1DOF VIV while applying Proper Orthogonal Decomposition to identify the most coherent modes in the boundary regions. These findings provide valuable insights into wake modes associated with VIV and emphasize the significance of considering 3D effects for more accurate simulations and understanding.